Toothbrush



FIG. 1 is a perspective view of a toothbrush showing our new design, the head portion being shown in broken lines for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a side elevational view thereof; and,

FIG. 3 is a rear elevational view thereof. 

The ornamental design for a toothbrush, as shown and described. 